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Mr Darin L Rouse <br /> ExxonMobil Corporation <br /> April 13,2000 <br /> Page 2 <br /> Discussion and Recommendations <br />' In June 1999, monitoring wells MW-9 and MW-10 were installed adjacent to monitoring wells MW-2 <br /> and MW-3 Since approximately November 1995, the water table elevation was above the tops of the <br /> screens in MW-2 and MW-3 The purpose of MW-9 and MW-10 was to provide wells screened across <br /> the water table Two quarters of water quality data show that concentrations of analytes in MW-9 and <br /> MW-10 are consistent with concentrations obtained from MW-2 and MW-3 between 1995 and 1999 <br />' Based on ground water measurements collected since monitoring activities began at the site in <br /> August 1991, flow direction has been historically towards the northeast with some seasonal variances <br /> towards the east Southland,the owner of the property located west of the former Exxon service station <br /> ' has recently removed and replaced its underground storage tanks As a result of soil conditions <br /> encountered within the tank basin, Southland has initiated a soil and ground water contamination <br /> ' investigation <br /> We recommend that a report be submitted to the San Joaquin County Environmental Health Department <br /> documenting that the site is a candidate for case closure of the environmental case <br /> 1 Remarks/Signatures <br /> The interpretations contained in this report represent our professional opinions and are based, in part, on <br /> information supplied by the client These opinions are based on currently available information and are <br /> arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time <br /> and location Other than this, no warranty is implied or intended <br /> Future Work <br /> ' The next ground water sampling is scheduled for May 2000 <br /> Delta recommends that a copy of this report be forwarded to <br /> ' Mr Mike Infurna Ms Elizabeth Thayer <br /> San Joaquin County Environmental Health California Regional Water Quality Control Board, <br /> ' Division, Public Health Services Central Valley Region <br /> Post Office Box 2009 3442 Routier Road, Suite A <br /> Stockton,CA 95201 Sacramento,CA 95827-3098 <br />